/**
 * Copyright 2009-2019 the original author or authors.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ibatis.binding;

import org.apache.ibatis.binding.MapperProxy.MapperMethodInvoker;
import org.apache.ibatis.session.SqlSession;

import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author Lasse Voss
 */
public class MapperProxyFactory<T> {
	
	private final Class<T> mapperInterface;
	private final Map<Method, MapperMethodInvoker> methodCache = new ConcurrentHashMap<>();
	
	public MapperProxyFactory(Class<T> mapperInterface) {
		this.mapperInterface = mapperInterface;
	}
	
	public Class<T> getMapperInterface() {
		return mapperInterface;
	}
	
	public Map<Method, MapperMethodInvoker> getMethodCache() {
		return methodCache;
	}
	
	@SuppressWarnings ("unchecked")
	protected T newInstance(MapperProxy<T> mapperProxy) {
		return (T) Proxy.newProxyInstance(mapperInterface.getClassLoader(), new Class[]{mapperInterface}, mapperProxy);
	}
	
	/**
	 * 创建新的 Mapper 代理对象返回
	 * @param sqlSession
	 * @return
	 */
	public T newInstance(SqlSession sqlSession) {
		final MapperProxy<T> mapperProxy = new MapperProxy<>(sqlSession, mapperInterface, methodCache);
		return newInstance(mapperProxy);
	}
	
}
